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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7466a3bddb26fdc7640b813686687717cd1b96e6339a23494078ac3b48b49cab' 
  AND token = '0Y7Vc80IbS3FK3PbYXVcw6C3E3SUAZe0NuBbxS8d6RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}